Improvement in distance-measuring devices



A. FELLDIN. Distance-Measuring De vioe. No. 210,931. Patented Dec. 17,1878.

KIIIIIIIEFII Jo vllliljill'lill1ll?ia Witnesses a6)? a;

Inventor: ($56141, WW

IL PETERS PHOTO-LHHUGFIAPHEL wAsKmG'mN. u c.

ABRAHAM FELLDIX, OF BROOKLYN, NEW YORK.

lMPROVEMENT lN DISTAN Specification forming part of Letters Patent To all whom it may concern Be it known that I, ABRAHAM FELLDI1\',Of Brooklyn, in the county of Kings and State of New York, have invented a new and 1mproved Distancedlleasurer, of which the following is a specification:

The object of my invention is to provide an instrument, simple in construction and convenient in use, for measuring distances between objects without the use of a chain, tapeline, or their equivalents.

In the accompanying drawing, Figure 1 represents a side elevation, and Fi g. 2 a top view, of my improved distance-micasurer. Fig. 3 is a side view, and Fig. at a front view, of the upper part of the indicator.

Similar letters of reference indicate corre' spondin g parts. 7

A is a horizontal disk, having in its center the vertical tap a. B is ascale fastened to the disk A. (l is a movable scale swinging around the tap a, the point of the angle formed by the inner sides of both scales always being in the center of the tap a. D is a sliding scale, having a pin, (1, at one end, which runs in a slot cut into the disk A in a way so that the center of the pin always lies in the line of the inner side of the scale B. D is an upright, swinging on the tap, a, and having at its lower end the scale E, fastened to it by means of screws and a brace, ormade in one piece with same, the angle between the center line of the upright D and the upper side of the scale E to be a true right angle.

In the upper part of the upright D is a top bar, F, resting on the axle f, and adjustable to different inclinations by means of the screw G, running through the top block This screw has at its lower end a nut, which works in a notch cut into the upper edge of said top bar, the center of the axief to lie in a line with the under side of the top bar F.

M is a set-screw, running through the top bar F and the slot or, out into the brace N, which brace is fastened at its other end to the scale E, the object of this brace being to hold the top bar F in a iirm position while readin g oil the distance from the scale E.

' I is an indicator, the lower end of which rests on the upper side of the scale E, and is kept in place by the guides t '23. K K are balancingblock.

CE-MEASURlNG DEVICES.

guides, fastened to the upper end of the indicator by means of the screws 7a is, and adj ustable (for purpose of changing or correcting the scale) to difi'erent higher or lower positions by means of slots, through which the screws run. L is a balancing block, resting on the axle Z, which rests with its ends in the guides K K, the upper half of the part of the axle lying between the guides K K being tiled off, so as to cause the center of the axle to lie in the line of the upper surface of the In a full-sized instrument the disk A has to rest on a tripod, and is to be adjusted to a horizontal position by screws.

To find the distance from the place of observation to a certain object, adjust the disk A to a horizontal position turn the upright D so that the scale E points to the object to which the distance is wanted to be known; aini along the upper side of said scale E, and observe in what point the line of sight strikes the object; loosen the set-screw M; now aim along the under side of the top bar F, adjust-'- in g the same by turning the screw Gr until the line of sight strikes the same pointi. 8., the point of the angle between the two lines of sight meets the object; fasten the set-screw M insert between the top bar F and scale E the indicator I, and move it forward until it rests firmly between both. The mark at the lower edge of the indicator (being in the center line of the indicator and right under the center of the axle I) will show on the scale E the distance. between the point of observation and the object.

To find the interval between two objects, both being a distance from the point of observation, measure the distance from the place where the instrument stands to one ofthe objects, as above described; turn the upright and measure the distance to the other object in a similar way; then bring over the scale C so that the inner edge of same comes right under the scale E. Suppose the first distance to have been forty yards, the other fiftytwo yards; bring up the sliding scale D so that the inner side of said scale lies from the mark 40 on. the scale B to the mark 52 on the inner side of the scale 0. The mark on the scale D which then comes at the point of intersection between the inner sides of the scales 0 and D indicates the number of yards between the objects.

It will be understood that by fixing the disk A in a vertical instead of horizontal position, the height of an object may be obtained by a similar operation to that above mentioned.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The upright D,-swinging on the tap a, and carrying the bottom scale E and top bar F, adjustable by the screw Gr, running through the top block H, substantially as and for the purpose set forth.

D, in combination with the upright D (carrying the fixed scale E and adjustable top bar F) and indicator I, substantially as described, and for the purpose specified and set forth.

ABRAHAM FELLDIN.

Witnesses H. RYD UIs'r, FREDK. WEBER. 

